Here is a nice refresher on VSEPR Theory
Category: Symmetry and Point Groups
This chart from Washington University in St. Louis is a great resource for additional help with molecular geometries, which is critical in assigning the correct point groups to molecules.
This guide from the University of Alabama has some nice visual aids and examples. A symmetry flow chart is also included.
Student recommended post:
In this Chemical Education Digital Library Models 3D a molecule viewing program is integrated that allows you to view symmetry elements for a selection of different molecules.
Additionally the program allows for visualization for molecule vibrations & stretches, bond angles & lengths, electrostatic potentials and molecular orbital images.
View here: http://www.chemeddl.org/resources/models360/models.php
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An overview website containing a variety of interactive symmetry tools.